Rolling-mill for producing tubes.



M. PETERS. ROLLING MILL FOR PRODUCING TUBES.

APPLICATION FILED APILZS, 1909.

--Patented Sept 13, 1920.

ae a? Q5 sh a a. amfaw of the worb iece'while it p asselsthrough'thei M} a 1 l k w 'if h chanical-qengi een subjeqt{0L the ;Gamma Emperor; andfre'siidin 'a'. t; d ff; 1G 1, any, tain andfnsegil Bolling-M l: for Producing T b t f qll. a sr p fy cation;

ingot 'o'r mandr'els," and to more readily extract. the;

over a "mandrel,

"i irw ir as much duringtherollingprocess. The speed last pairof rolls isjjasinuch greater .than

while passing through the first pair of'rolls,

as the inelo'sed profile of-tll rolls, after-tie v ducting the cross s'ection of the 'mandrel," is larger than the profile iinclosed byfthe last pair of'rolls. "The speed of the. work-piece,

therefore increases from one pairofrolls to the other. ,The speed,-falso, with which the; work-piece}aite'i havin' beenrolled, leaves one pair of 'rolls' is, as as been ascertained sponding pair of rolls. s If during the rolling process the mandrel is left entirely to'itself, it moves forward,-

togethor with" the work-piece, with a speed which "is greater than the peripheral-speed of the r01 4 The mandrel-thus'gos ahead of that'-- pa rt o'f the.work piece"whicl1 is' within the first," pair" of rollsfandi-remainsbehind that part of the worlt pii'e'c'e whi'clid's'within, the last pair ofrolls',flthereby under great friction, al e-gum pierced ,walls of the work-f piecqgthejspeed 0f the 'Inandrel being thesame as thespeed of matters of the workpiece within the middle pair otrolls. Itis evident that neitherthe power required for s psi/LE 1 v I i t i y t w srATEs PATENT :torFIon- I st t' nm ro i ti' rnenucme i i invention relate'slto. 'rollingi mills for seamless n tubes" from. a hollow arik and it' has for] its l object to.' so regulate "the forward motion v"of 4 the man- I drel emplbyed iii such mills that 'its speedshall not 'eiic'eed" the, average speed ..of:,,the. rolls, whereby it. .beomesijpo's'sible. tot-roll llit'tle slower-gone-attains the. advanta e of In -mills Y E V- lig f r qll g tubss "i h fih h Q he;

p i i" s e f the- 219 1. *p rolls, with;'aaes'trossing lone another, "and;- arranged behindif'eaclr other," Varies yery s ofthefirst' pair of rolls and less than that bf the rolls'hfth'e last pair of. rolls :the workingiiofj tlie' rolling-device'will be in-' ereased," nor that thetqqality 'of'the tttBB' to she-produced be influenced 'unfavorably ifthe' -.nia1idrelitself isrforced to oyvwith -the' reatest speed ofthe worlr'=pieee or'with the .lleast speed of'thework vpi'ece; for' thetotal amounteE-the frictio'n -to be 'overome, b'e tween the mandrel and the pierced 'wall, will be-nearly the samein both'casesl 7 The force swith which the mandrel has to be pushed -forward onbe kept back for; effecting such a f; ;1notion,.i's therefore an insi nificant em as I the trial-:show's-and as must be 'evidentfroin I "theoretical consideration. Howevenas the mandrel-itself is forced tomove itself withfzo the least spe'ed dithe workpiece; or'ey'en a being able to roll-tubes; of ma lengthb'y'; =means ofishortmandrels'an' tozextrachthe inandrels: out of the finished tubes-in which manipulation; the mandrels often break-Qofi'" .inuehqnieke'r and easier. Thenature of my invention will behest 1 .underst'ood in connection with the accompanying drawing, in which Figure :l-isanJelevation ofthe rolling mill, the. pierced bloom being supported on rollers and the mandrel.not yet inserted. Fig. '2 is a similar view showing the man- ,drelf passing through the pierced blcom' which is about to enter the rolls. Fig; 3 'is H p Y a fragmentary pla'niview of Fig.2.- Similar characters ofreferences designate corresponding parts throughout the several: '1 j views. 3'90 Referring now to the drawings,'it will-be noted that this new arrangement consists of a small truck running on rails, which is provided with agap-clutch'for carrying the end of the mandrel, arid can becoupled to' an endless link chaimtrunning over rollers, and moving at a speed corresponding preferably to the peripheral speed of the first pair of rollsand-in the directions of the-motion of the work-pieces In-the position. shown'in- Fig. 1, the mandrel 0 has been entirely drawn 'i z .backandthe work-piece f, a. pierced blo'om, 7

has justbeenplaced 'uponflthe rollers m. Theouter endlof the mandrel then rests in the 'gap clutchj h' of .thesmall truck 11' 'run min on rails s, and the inner end ona roller 17;. 0 the small truck, seen in Fig.8 fromabove, a lever e is attached, the end of which is so formed that during the descent of the lever-it hooks itself firmly to a link ofthe 110 isb - are adjusted in such endless chain 0 between, rails s.

drel has passed through the hole in the bl om f and after it hasentered into the rolling-device to some extent (this distance mg detelmined fact that the inner end' of the slowly movmg mandrel must not-be overtaken by the tr continually faster moving front-part of the workiece, before ,it reaches the last air of ro s) the'blmfm' f which has been eld until that moment is allowed to also run along and to enter into the first pair of rolls, as is shown in Fig. 2. j

The sto i which operate upon the gapclutch 7i ig. 2) and which pen the same, a. way, that,-when the mandrel together. with the workpiece has Fig. 2 and thus the truck at coupled to the continually progressa r the mner'end of the manby consideration of the' left the re device, the-inner end of thenandrehprojecting out. of the work-piece inc, in order to be ex- 13 only' Lust so 102 thatit can easily be f i ed the ma a t d. $130 the uncoup shall preferably be done automatically by suitab e stops. After having been uncoupled, the truck returns to its original position by means of a weight k or the like ooked to, a rope running over rollers, to take up another mandrel. 7

he chain, of course, could also'be driven withnon-uniform, gradually increasin speed, and the truck might be replaced by a simple sh g-device.

claim h 1. In a rolling mill for formin seamless tubes from a hollow ingot or. bl a series of rolls having their passes in alinement; means to support said ingot previous to its entry between said 'rolls; a mandrel ada ted to enter the ingot so s'u ported, and to pass with the same into-sai series of rolls; movable means to support the outer'end of said mandrel and to travel toward theksaid series of rolls; and driving means for said g of the truck.

tubes to support the outer end of said mandrel ,and to-travel upon the said rails toward said series of rolls; dr ving means for said truck to control the speed-0f the mandrel in the passesas the tube is being rolled; means to couple said mandrel to said truck; and means to couple said truck to said driving means.

3. In a rolling 'milljor forming seamless to itsentry between said rolls; a mandrel adapted to enter the ingot so sup 'rted, and to pass with'the same into sai series of rolls; a truck, and rails u 'n which said uck is movable saidtrue; being adapted to support the outer end of said mandrel and to travel upon series of rolls; driving means for said. truck to control the's ed of the mandrel in the passes as the tu e is being rolled; means to couple said mandrel to said truck; means to couple said truck tosaid drivin means; and means to uncouple said man rel from 'oin a hollow ingot or'blank: a series of rolls having their asses in aline ment; means to support sai ingot previous the said rails toward said said truck w hen. the latter arrives at a pie determined point of said rails.

4. In a rollin mill for formin seamless a series asses in alinement; means to support said mgot previous to its entry between said rolls; a mandrel adapted.to enter the ingot so su ported, and to pass with the same into sai series of rolls; a truck, and'rails upon which said truck is movable, said truck being adapted to supporttheouter end of said mandrel and totravel uponthe said rails toward said series of rolls; driving means for said truck to control the speed of-the mandrel in the passes as the tube is bein rolled; means to couple said mandrel to said truclz; means to couple saidtruclt to said drivm means; means to uncouple said mandrel i romsaid truck when the latter arrives at a predetermined point of said rails; and means to return said truck when the same is uncoupled.

- 5. In a rolling mill for forming seamless tubes from a hollow ingot or blank; a plurality of pairs of rolls, with axes crossing one another and havin their passes in alinemerit; means to suppo t said ingot previous to its entry between the said rolls; a mani'novable means to control the s ed of the ..drel adapted to enter the ingot so supported mandrel in the passes as the-tn 'is being and to passwith the same into said series 9 rolled. rolls; a truck, and rails upon which said 2. In a rolling mill for formingseamless' tubes from a hollow ingot or blank: a se-- ries of rolls having their passes in alinement; means to support said ingot previous to its entry between said rolls; a mandrel adapted to enterthe ingot so supported, and to pass with the same into said series of rolls; a truck, and railsupon which said truck is movable, said truck being adapted In testimony whereof I have signed my name to the specification in the presence of two subscribing Witnesses.

MATHIAS PETERS. [11. 5.] Witnesses O'mo Ktimc,

J. "WRIGHT.

ample said'mandre]. to saidtruck; means to couple saidiruckfifio said chain; means to uncquple said mj' mdrel from said truck when the latterl'arrivs at a predgtermined point 'of said rails; means to uncouple said truck from said chain; and meansto return said truck whe'nthe same is uncoupled. 

